/usr/share/maven-repo/io/netty/netty-codec/debian/netty-codec-debian.jar is in libnetty-java 1:4.1.7-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/io/netty/netty-codec/debian/../../../../../java/netty-codec.jar